package com.wlsk.license.handler;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.support.spring.PropertyPreFilters;
import com.wlsk.license.common.annotation.Log;
import org.apache.commons.lang3.ObjectUtils;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.validation.BindingResult;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;

/**
 * 操作日志记录处理
 * 
 * @author taxisys
 */
@Aspect
@Component
public class LogAspect
{
    private static final Logger log = LoggerFactory.getLogger(LogAspect.class);

    private static final String uid = "uid";

    /** 排除敏感属性字段 */
    public static final String[] EXCLUDE_PROPERTIES = {"password"};


    // 配置织入点
    @Pointcut("@annotation(com.wlsk.license.common.annotation.Log)")
    public void logPointCut()
    {
    }

    /**
     * 处理完请求后执行
     *
     * @param joinPoint 切点
     */
    @AfterReturning(pointcut = "logPointCut()", returning = "jsonResult")
    public void doAfterReturning(JoinPoint joinPoint, Object jsonResult)
    {
        handleLog(joinPoint, null, jsonResult);
    }

    /**
     * 拦截异常操作
     * 
     * @param joinPoint 切点
     * @param e 异常
     */
    @AfterThrowing(value = "logPointCut()", throwing = "e")
    public void doAfterThrowing(JoinPoint joinPoint, Exception e)
    {
        handleLog(joinPoint, e, null);
    }

    protected void handleLog(final JoinPoint joinPoint, final Exception e, Object jsonResult)
    {
        try {
            // 获得注解
            Log controllerLog = getAnnotationLog(joinPoint);
            if (controllerLog == null) {
                return;
            }
            HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
            String methodName = joinPoint.getSignature().getName();
            String className = joinPoint.getSignature().getDeclaringTypeName();
            String uri = request.getRequestURI();

        } catch (Exception exp) {
            // 记录本地异常日志
            log.error("==前置通知异常==");
            log.error("异常信息:{}", exp.getMessage());
        }
    }


    /**
     * 是否存在注解，如果存在就获取
     */
    private Log getAnnotationLog(JoinPoint joinPoint) throws Exception
    {
        Signature signature = joinPoint.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        Method method = methodSignature.getMethod();

        if (method != null)
        {
            return method.getAnnotation(Log.class);
        }
        return null;
    }

    /**
     * 忽略敏感属性
     */
    public PropertyPreFilters.MySimplePropertyPreFilter excludePropertyPreFilter()
    {
        return new PropertyPreFilters().addFilter().addExcludes(EXCLUDE_PROPERTIES);
    }

    /**
     * 参数拼装
     */
    private String argsArrayToString(Object[] paramsArray)
    {
        String params = "";
        if (paramsArray != null && paramsArray.length > 0)
        {
            for (int i = 0; i < paramsArray.length; i++)
            {
                if (ObjectUtils.isNotEmpty(paramsArray[i]) && !isFilterObject(paramsArray[i]))
                {
                    Object jsonObj = JSONObject.toJSONString(paramsArray[i], excludePropertyPreFilter());
                    params += jsonObj.toString() + " ";
                }
            }
        }
        return params.trim();
    }

    /**
     * 判断是否需要过滤的对象。
     * 
     * @param o 对象信息。
     * @return 如果是需要过滤的对象，则返回true；否则返回false。
     */
    @SuppressWarnings("rawtypes")
    public boolean isFilterObject(final Object o)
    {
        Class<?> clazz = o.getClass();
        if (clazz.isArray())
        {
            return clazz.getComponentType().isAssignableFrom(MultipartFile.class);
        }
        else if (Collection.class.isAssignableFrom(clazz))
        {
            Collection collection = (Collection) o;
            for (Iterator iter = collection.iterator(); iter.hasNext();)
            {
                return iter.next() instanceof MultipartFile;
            }
        }
        else if (Map.class.isAssignableFrom(clazz))
        {
            Map map = (Map) o;
            for (Iterator iter = map.entrySet().iterator(); iter.hasNext();)
            {
                Map.Entry entry = (Map.Entry) iter.next();
                return entry.getValue() instanceof MultipartFile;
            }
        }
        return o instanceof MultipartFile || o instanceof HttpServletRequest || o instanceof HttpServletResponse
                || o instanceof BindingResult;
    }

    public String getClientIpAddress(HttpServletRequest request) {
        String xfHeader = request.getHeader("X-Forwarded-For");
        if (xfHeader == null) {
            xfHeader = request.getHeader("X-Real-IP");
        }
        if (xfHeader == null) {
            xfHeader = request.getHeader("Proxy-Client-IP");
        }
        if (xfHeader == null) {
            xfHeader = request.getHeader("WL-Proxy-Client-IP");
        }
        if (xfHeader != null) {
            // "X-Forwarded-For" can contain a list of comma-separated IP addresses
            // The first one is the original client
            String[] xfAddr = xfHeader.split(",");
            return xfAddr[0].trim();
        }
        return request.getRemoteAddr();
    }

    public String userInfo(JoinPoint joinPoint, HttpServletRequest request) {
        Object[] args = joinPoint.getArgs();
        if (ObjectUtils.isNotEmpty(args)) {
            for(Object obj : args) {
                Map argMap = JSONObject.parseObject(JSONObject.toJSONString(obj), Map.class);
                if(argMap != null && argMap.containsKey(uid) && argMap.get(uid) != null) {
                    return argMap.get(uid).toString();
                }
            }
        } else {
            // 获取请求参数
            Enumeration<String> parameterNames = request.getParameterNames();
            while (parameterNames.hasMoreElements()) {
                String paramName = parameterNames.nextElement();
                if(uid.equals(paramName)) {
                    return request.getParameter(paramName);
                }
            }
        }
        return "";
    }
}
